Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-swiftpm.yml

@@ -31,7 +31,7 @@ jobs:
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         if: ${{ needs.filter.outputs.should_skip != 'true' }}
       - run: swift build
         if: ${{ needs.filter.outputs.should_skip != 'true' }}
@@ -49,7 +49,7 @@ jobs:
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         if: ${{ needs.filter.outputs.should_skip != 'true' }}
       - run: swift build
         if: ${{ needs.filter.outputs.should_skip != 'true' }}
@@ -69,7 +69,7 @@ jobs:
       fail-fast: false
     container: ${{ matrix.container }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         if: ${{ needs.filter.outputs.should_skip != 'true' }}
       - run: swift build
         if: ${{ needs.filter.outputs.should_skip != 'true' }}
@@ -81,6 +81,6 @@ jobs:
     needs: filter
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: skiptools/swift-android-action@v2
 

.github/workflows/documentation.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Build Docs
         run: |

.github/workflows/swiftlint.yml

@@ -11,5 +11,5 @@ jobs:
   lint:
     runs-on: ubuntu-latest    
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: norio-nomura/[email protected]